Lymphoplasmacytic lymphoma laboratory findings: Difference between revisions
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==Laboratory Findings== | ==Laboratory Findings== | ||
WM is mostly suspected when a patient has low blood counts and/or high levels of unusual protein levels on blood tests. Then usually after that, a blood test called [[serum protein electrophoresis]] is ordered to find out what type of protein is there. And mostly, only after these tests are done that a biopsy of either the bone marrow or a lymph node is considered to confirm the WM diagnosis. Laboratory findings consistent with the diagnosis of Waldenström macroglobulinemia include:<ref name="pmid11736938">{{cite journal| author=García-Sanz R, Montoto S, Torrequebrada A, de Coca AG, Petit J, Sureda A et al.| title=Waldenström macroglobulinaemia: presenting features and outcome in a series with 217 cases. | journal=Br J Haematol | year= 2001 | volume= 115 | issue= 3 | pages= 575-82 | pmid=11736938 | doi= | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=11736938 }} </ref> | |||
* '''Complete blood count:''' | |||
**[[Anemia]]. | |||
***Seen in 40% of newly diagnosed patients and in 80% of symptomatic patients with Waldenström's macroglobulinemia. | |||
***Multi-factorial causes including: decreased RBC synthesis due to [[bone marrow infiltration]], [[iron deficiency]] due to [[gastrointestinal bleeding]], and [[chronic inflammation]]. | |||
**[[Thrombocytopenia]]. | |||
***Due to bone marrow infiltration. | |||
**** | |||
**[[Neutropenia]]. | |||
[ | ***Due to bone marrow infiltration. | ||
**[[Lymphocytosis]]. | |||
**[[Monocytosis]]. | |||
* '''Peripheral smear''': | |||
**[[Plasmacytoid]] lymphocytes. | |||
*[ | **[[Normocytic normochromic anemia|Normocytic normochromic red blood cells]]. | ||
*[ | **[[Rouleaux]] formation. | ||
* | * '''Chemistry Lab tests:'''<ref name="pmid19520758">{{cite journal| author=Katzmann JA, Kyle RA, Benson J, Larson DR, Snyder MR, Lust JA et al.| title=Screening panels for detection of monoclonal gammopathies. | journal=Clin Chem | year= 2009 | volume= 55 | issue= 8 | pages= 1517-22 | pmid=19520758 | doi=10.1373/clinchem.2009.126664 | pmc=3773468 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=19520758 }} </ref> | ||
**Elevated [[lactate dehydrogenase]] (LDH). | |||
***Level indicates the extent of the disease. | |||
**Elevated [[urea]] and [[creatinine]]. | |||
***Rarely | |||
**Electrolyte abnormalities: | |||
***[[Hypercalcemia]]. | |||
***[[Hyponatremia]]. | |||
**Elevated [[erythrocyte sedimentation rate]] (ESR) and [[uric acid]]. | |||
**[[Rheumatoid factor]], [[cryoglobulins]], direct anti-globulin test, and [[cold agglutinin titre]] results can be positive. | |||
**Elevated [[beta-2-microglobulin]] in proportion to tumor mass. | |||
*** Needed to evaluate prognosis. | |||
* '''Platelet function test and blood coagulation studies:''' | |||
** Prolonged bleeding time.<ref name="pmid4924493">{{cite journal| author=Penny R, Castaldi PA, Whitsed HM| title=Inflammation and haemostasis in paraproteinaemias. | journal=Br J Haematol | year= 1971 | volume= 20 | issue= 1 | pages= 35-44 | pmid=4924493 | doi= | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=4924493 }} </ref> | |||
*** Possibly due to interaction between [[platelet]] membrane [[Glycoprotein|glycoproteins]] and [[IgM]] [[paraprotein]]. | |||
** Abnormalities in [[prothrombin time]], [[activated partial thromboplastin time]], [[thrombin time]], and [[fibrinogen]]. | |||
* '''Mutational analysis:''' The ''[[MYD88]]'' gene mutation has been found in more than 90% of patients with Waldenstrom's macroglobulinemia.<ref name="pmid23321251">{{cite journal| author=Xu L, Hunter ZR, Yang G, Zhou Y, Cao Y, Liu X et al.| title=MYD88 L265P in Waldenström macroglobulinemia, immunoglobulin M monoclonal gammopathy, and other B-cell lymphoproliferative disorders using conventional and quantitative allele-specific polymerase chain reaction. | journal=Blood | year= 2013 | volume= 121 | issue= 11 | pages= 2051-8 | pmid=23321251 | doi=10.1182/blood-2012-09-454355 | pmc=3596964 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=23321251 }} </ref> | |||
*'''Cryocrit:''' | |||
**This test measures the blood levels of cryoglobulins (proteins that clump together in cool temperatures and can block blood vessels). | |||
*'''Cold agglutinins:''' | |||
**Cold agglutinins are antibodies that attack and kill red blood cells, especially at cooler temperatures. These dead cells can then build up and block blood vessels. A blood test can be used to detect these antibodies. | |||
*'''Beta-2 microglobulin (β2M):''' | |||
**This test measures another protein made by the cancer cells in WM. This protein itself doesn’t cause any problems, but it’s a useful indicator of a patient’s prognosis (outlook). High levels of β2M are linked with a worse outlook. | |||
*'''Urinanalysis:''' | |||
**Proteinuria. | |||
==References== | ==References== | ||
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief:
Overview
An elevated/reduced concentration of serum/blood/urinary/CSF/other [lab test] is diagnostic of [disease name].
OR
Laboratory findings consistent with the diagnosis of [disease name] include [abnormal test 1], [abnormal test 2], and [abnormal test 3].
OR
[Test] is usually normal for patients with [disease name].
OR
Some patients with [disease name] may have elevated/reduced concentration of [test], which is usually suggestive of [progression/complication].
OR
There are no diagnostic laboratory findings associated with [disease name].
Laboratory Findings
WM is mostly suspected when a patient has low blood counts and/or high levels of unusual protein levels on blood tests. Then usually after that, a blood test called serum protein electrophoresis is ordered to find out what type of protein is there. And mostly, only after these tests are done that a biopsy of either the bone marrow or a lymph node is considered to confirm the WM diagnosis. Laboratory findings consistent with the diagnosis of Waldenström macroglobulinemia include:[1]
- Complete blood count:
- Anemia.
- Seen in 40% of newly diagnosed patients and in 80% of symptomatic patients with Waldenström's macroglobulinemia.
- Multi-factorial causes including: decreased RBC synthesis due to bone marrow infiltration, iron deficiency due to gastrointestinal bleeding, and chronic inflammation.
- Thrombocytopenia.
- Due to bone marrow infiltration.
- Due to bone marrow infiltration.
- Neutropenia.
- Due to bone marrow infiltration.
- Lymphocytosis.
- Monocytosis.
- Anemia.
- Peripheral smear:
- Plasmacytoid lymphocytes.
- Normocytic normochromic red blood cells.
- Rouleaux formation.
- Chemistry Lab tests:[2]
- Elevated lactate dehydrogenase (LDH).
- Level indicates the extent of the disease.
- Elevated urea and creatinine.
- Rarely
- Electrolyte abnormalities:
- Elevated erythrocyte sedimentation rate (ESR) and uric acid.
- Rheumatoid factor, cryoglobulins, direct anti-globulin test, and cold agglutinin titre results can be positive.
- Elevated beta-2-microglobulin in proportion to tumor mass.
- Needed to evaluate prognosis.
- Elevated lactate dehydrogenase (LDH).
- Platelet function test and blood coagulation studies:
- Prolonged bleeding time.[3]
- Possibly due to interaction between platelet membrane glycoproteins and IgM paraprotein.
- Abnormalities in prothrombin time, activated partial thromboplastin time, thrombin time, and fibrinogen.
- Prolonged bleeding time.[3]
- Mutational analysis: The MYD88 gene mutation has been found in more than 90% of patients with Waldenstrom's macroglobulinemia.[4]
- Cryocrit:
- This test measures the blood levels of cryoglobulins (proteins that clump together in cool temperatures and can block blood vessels).
- Cold agglutinins:
- Cold agglutinins are antibodies that attack and kill red blood cells, especially at cooler temperatures. These dead cells can then build up and block blood vessels. A blood test can be used to detect these antibodies.
- Beta-2 microglobulin (β2M):
- This test measures another protein made by the cancer cells in WM. This protein itself doesn’t cause any problems, but it’s a useful indicator of a patient’s prognosis (outlook). High levels of β2M are linked with a worse outlook.
- Urinanalysis:
- Proteinuria.
References
- ↑ García-Sanz R, Montoto S, Torrequebrada A, de Coca AG, Petit J, Sureda A; et al. (2001). "Waldenström macroglobulinaemia: presenting features and outcome in a series with 217 cases". Br J Haematol. 115 (3): 575–82. PMID 11736938.
- ↑ Katzmann JA, Kyle RA, Benson J, Larson DR, Snyder MR, Lust JA; et al. (2009). "Screening panels for detection of monoclonal gammopathies". Clin Chem. 55 (8): 1517–22. doi:10.1373/clinchem.2009.126664. PMC 3773468. PMID 19520758.
- ↑ Penny R, Castaldi PA, Whitsed HM (1971). "Inflammation and haemostasis in paraproteinaemias". Br J Haematol. 20 (1): 35–44. PMID 4924493.
- ↑ Xu L, Hunter ZR, Yang G, Zhou Y, Cao Y, Liu X; et al. (2013). "MYD88 L265P in Waldenström macroglobulinemia, immunoglobulin M monoclonal gammopathy, and other B-cell lymphoproliferative disorders using conventional and quantitative allele-specific polymerase chain reaction". Blood. 121 (11): 2051–8. doi:10.1182/blood-2012-09-454355. PMC 3596964. PMID 23321251.